Access Masters in a Filter Plugin when run as Custom Parameter

Scripting
1

Is it possible somehow to still access the master layers, when adding a certain Filter Plugin as a CP on an Export-Instance?

My filter plugin can do that when run in the UI, it does some path operations using the drawings of 2 masters. However when it’s run as a CP, I only have access to the one default layer “Regular” of each glyph. At least per default. Is there a way to inject the desired master layers somehow beforehad, so that the filter can work with those?

2

That is currently not possible for a filter.

3

Thanks, that’s good to know at least :slight_smile:

4

It might be possible with this:

	@objc.python_method
	def settings(self):
		self.menuName = Glyphs.localize({
			'en': 'Prepare Layer',
		})
		GSCallbackHandler.addCallback_forOperation_(self, "GSPrepareLayerCallback")

	@objc.typedSelector(b'c32@:@@o^@')
	def processGlyph_instance_error_(self, glyph, instance, error):
		print("__", glyph, instance)
		return True

This can be added to any plugin, just make sure that you don’t add that callback more than once.

5

Thank you, I’ll experiment with that.
Should I also remove that callback at some point? The Filter Plugin doesn’t have some sort of dealloc method, or?

6

Filters are only instantiated once and are not released until the app is closed. Some with “glyphsPluging”. All the other plugins are instantiated and deallocated a lot.

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